extract package metadata from */package.json

docs/lib/add-package-meta.js

@@ -12,7 +12,7 @@ module.exports = function addPackageMeta(options = {}) {
       if (pkg) {
         file[namespace].package = fields ? pluck(pkg, fields) : pkg
       } else {
-        log('no package.json found relative to', fullPath)
+        log('no package.json found relative to', path)
       }
     }
     done()

docs/lib/add-source.js

@@ -9,6 +9,8 @@ module.exports = function addSource(options = {}) {
   }
   const {branch, repo} = options
   return each((file, source) => {
-    file[namespace].source = `https://github.com/${repo}/tree/${branch}/modules/${source}`
+    if (file[namespace]) {
+      file[namespace].source = `https://github.com/${repo}/tree/${branch}/modules/${source}`
+    }
   })
 }

docs/lib/extract-packages-json.js

@@ -0,0 +1,44 @@
+module.exports = {extractPackages, writePackagesJSON}
+
+function extractPackages(options = {}) {
+  return (files, metal, done) => {
+    const packages = {}
+    for (const key of Object.keys(files)) {
+      if (key.endsWith('package.json')) {
+        const file = files[key]
+        const pkg = JSON.parse(String(file.contents))
+        const plucked = pluck(pkg, [
+          'name',
+          'description',
+          'version'
+        ])
+        plucked.dependencies = pkg.dependencies
+          ? Object.keys(pkg.dependencies)
+          : []
+        packages[pkg.name] = plucked
+      }
+    }
+    const meta = metal.metadata()
+    Object.assign(meta, {packages})
+    done()
+  }
+}
+
+function writePackagesJSON(options = {}) {
+  const {path = 'packages.json'} = options
+  return (files, metal, done) => {
+    const {packages} = metal.metadata()
+    files[path] = {
+      contents: JSON.stringify(packages, null, 2)
+    }
+    done()
+  }
+}
+
+function pluck(obj, keys) {
+  const plucked = {}
+  for (const key of keys) {
+    plucked[key] = obj[key]
+  }
+  return plucked
+}

docs/lib/rename.js

@@ -2,13 +2,15 @@ module.exports = function rename(fn, options = {}) {
   const {log = noop} = options
   return (files, metal, done) => {
     for (const [key, file] of Object.entries(files)) {
-      const dest = fn(file, key, files, metal)
-      if (dest && dest !== key) {
+      let dest = fn(file, key, files, metal)
+      if (dest === true) {
+        log(`[rename] keep: ${key}`)
+      } else if (dest && dest !== key) {
         log(`[rename] ${key} -> ${dest}`)
         file.path = dest
         files[dest] = file
         delete files[key]
-      } else if (!dest) {
+      } else if (dest === false) {
         log(`[rename] delete ${key}`)
         delete files[key]
       }

docs/lib/sync.js

@@ -5,6 +5,7 @@ const watch = require('metalsmith-watch')
 
 const addChangelog = require('./changelog')
 const addPackageMeta = require('./add-package-meta')
+const {extractPackages, writePackagesJSON} = require('./extract-packages-json')
 const addSource = require('./add-source')
 const filterBy = require('./filter-by')
 const parseDocComments = require('./parse-doc-comments')
@@ -30,13 +31,15 @@ module.exports = function sync(options = {}) {
     // ignore anything containing "node_modules" in its path
     .ignore(path => path.includes('node_modules'))
     // only match files that look like docs
-    .use(filter(['**/README.md', '**/docs/*.md']))
+    .use(filter(['*/README.md', '*/docs/*.md', '*/package.json']))
+    .use(extractPackages())
     // convert <!-- %docs -->...<!-- %enddocs --> blocks into frontmatter
     .use(parseDocComments({log}))
     // parse frontmatter into "data" key of each file
     .use(frontmatter(metaOptions))
     // only match files that have a "path" key in their frontmatter
     .use(filterBy(file => file[ns].path))
+    .use(writePackagesJSON({path: 'packages.json'}))
     // write the source frontmatter key to the relative source path
     .use(
       addSource({
@@ -53,7 +56,7 @@ module.exports = function sync(options = {}) {
       })
     )
     // rename files with their "path" frontmatter key
-    .use(rename(file => `${file[ns].path}.md`), {log})
+    .use(rename(file => file[ns] ? `${file[ns].path}.md` : true), {log})
     .use(addChangelog('../CHANGELOG.md', 'whats-new/changelog.md', file => {
       file[ns] = {
         title: 'Changelog'